阳离子对嗜酸氧化亚铁硫杆菌氧化活性的影响

发布时间：2018-01-28 11:39

  本文关键词： 阳离子 嗜酸氧化亚铁硫杆菌 菌种活性 影响规律　出处：《稀有金属》2016年05期 　论文类型：期刊论文

【摘要】：以嗜酸氧化亚铁硫杆菌(Acidthiobacillus ferrooxidans,At.f,FN811931)为研究对象,研究了脉石矿物溶出阳离子(K~+,Mg~(2+),Ca~(2+)和Al~(3+))对At.f菌氧化活性的影响。研究结果表明:不同阳离子对At.f菌氧化活性的影响效应不同,其影响由大到小的顺序依次为Mg~(2+),Al~(3+),K+,Ca~(2+),当Mg~(2+),Al~(3+),K~+浓度分别超过1,5,10 g·L~(-1)时显著降低了At.f菌的氧化活性,而Ca~(2+)在所研究0~2 g·L~(-1)浓度范围内对At.f菌氧化活性影响不大。培养25 h时,低浓度条件下(0.5 g·L~(-1)),K+,Ca~(2+),Al~(3+),Mg~(2+)作用下的Fe~(2+)的氧化率分别为67.78%,68.76%,65.27%,61.28%,均高于不添加任何离子作用下的Fe~(2+)的氧化率(60.74%);高浓度条件下(15 g·L~(-1)),K+,Al~(3+),Mg~(2+)作用下的Fe~(2+)的氧化率分别为35.82%,25.25%,21.47%,均低于不添加任何离子作用下的Fe~(2+)的氧化率。阳离子Mg~(2+),Al~(3+),K~+随离子浓度的增加,Fe~(2+)的氧化率均呈现逐渐降低的趋势。
[Abstract]:Acidthiobacillus ferrooxidans At.fn811931 was used as the research object. In this paper, the dissolution of cationic (K ~ + mg ~ (2)) from gangue minerals was studied. The effects of Ca~(2 and Al~(3 on the oxidation activity of At.f bacteria were studied. The results showed that the effect of different cations on the oxidation activity of At.f bacteria was different. The order of its influence from big to small is Mg~(2 / Altinium 3 / K / K ~ 2 / C, respectively, when the concentration of Mg~(2 is more than 1 ~ 5 / L. The order of the effect is as follows: (1) the order of the effect is as follows: (1) K ~ (+) ~ (3). (10 g 路L ~ (-1)) significantly decreased the oxidation activity of At.f. However, Ca~(2 had little effect on the oxidation activity of At.f in the concentration range of 0 ~ 2 g 路L ~ (-1). Under the condition of low concentration, 0. 5 g 路L ~ (-1) ~ (-1) ~ (1) ~ (1) ~ (1) ~ (?). The oxidation rate of Fe~(2 under the action of Mg~(2 was 67.78% and 68.76%, 65.27% and 61.28%, respectively. The oxidation rate of Fe~(2 was 60.74% higher than that of Fe~(2 without adding any ions. The oxidation rates of Fe~(2 under high concentration (15 g 路L ~ (-1)) are 35.82% and 25.25%, respectively. 21.47 the oxidation rate of Fe~(2 was lower than that of Fe~(2 without adding any ions. The oxidation rate of cationic Mg~(2 was increased with the increase of ion concentration. The oxidation rate of Fe~(2 decreased gradually.
【作者单位】： 北京科技大学土木与环境工程学院金属矿山高效开采与安全教育部重点实验室;
【基金】：国家自然科学基金青年基金项目(51204011) 中国博士后科学基金第六批特别资助项目(2013T60063) 北京市优秀博士学位论文指导教师科技项目(20121000803)资助
【分类号】：TD925.5
【正文快照】： 氧化亚铁硫杆菌是以氧化亚铁离子、元素硫或还原态硫化合物获取能量生长的嗜酸硫氧化菌,是常见的硫化矿浸出功能菌[1-2]。黄铜矿是自然界中最主要的铜矿物,也是最难浸出的矿物之一[3]。绢云母、白云石、磷灰石以及萤石等是黄铜矿中常见的共伴生脉石矿物,细菌氧化浸出时其溶出，

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